10 questions · Four answers, and only one is true. Can you spot it?
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Question 1 of 10
Why does our heart beat?
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Being busy all over is what keeps you warm; the heart just pumps.
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It does speed up — but it never stops when we are calm.
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It is doing a job, not sending a message.
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It delivers oxygen and food — about a hundred thousand squeezes a day, without ever being told.
Show the answer
- A Being busy all over is what keeps you warm; the heart just pumps.
- B It does speed up — but it never stops when we are calm.
- C It is doing a job, not sending a message.
- D It delivers oxygen and food — about a hundred thousand squeezes a day, without ever being told.
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Question 2 of 10
How does the internet work?
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There is no single one — that is what makes it a web.
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Messages travel in small pieces to a computer waiting to help, called a server, and it answers in under a second.
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Switch off the connection and almost none of it is there.
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Most of the journey is through cables, many of them under the sea.
Show the answer
- A There is no single one — that is what makes it a web.
- B Messages travel in small pieces to a computer waiting to help, called a server, and it answers in under a second.
- C Switch off the connection and almost none of it is there.
- D Most of the journey is through cables, many of them under the sea.
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Question 3 of 10
Where did the dinosaurs go?
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Look out of the window: the birds are their family.
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One bad season would not have finished them; the change lasted far longer.
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The big ones died out — but birds are dinosaurs still here, and a huge crater near Mexico is very likely the dent it left.
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People arrived tens of millions of years too late.
Show the answer
- A Look out of the window: the birds are their family.
- B One bad season would not have finished them; the change lasted far longer.
- C The big ones died out — but birds are dinosaurs still here, and a huge crater near Mexico is very likely the dent it left.
- D People arrived tens of millions of years too late.
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Question 4 of 10
How do birds fly?
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Their bones are light and hollow. Push enough air down and you go up — then a bird can glide.
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Feathers are full of nothing but air, and are for pushing with.
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A bird falls if it stops flying, so it is heavier than the air.
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A bird takes off on a perfectly still day.
Show the answer
- A Their bones are light and hollow. Push enough air down and you go up — then a bird can glide.
- B Feathers are full of nothing but air, and are for pushing with.
- C A bird falls if it stops flying, so it is heavier than the air.
- D A bird takes off on a perfectly still day.
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Question 5 of 10
How can we tell how old a tree is?
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Bark tells you the kind of tree more than the years.
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Trees grow at very different speeds; a short old tree is quite ordinary.
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One ring for each year — a wide one means a good year, a thin one a hard year, so they tell stories too.
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Branches break and new ones sprout all the time.
Show the answer
- A Bark tells you the kind of tree more than the years.
- B Trees grow at very different speeds; a short old tree is quite ordinary.
- C One ring for each year — a wide one means a good year, a thin one a hard year, so they tell stories too.
- D Branches break and new ones sprout all the time.
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Question 6 of 10
Why do we have day and night?
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It only looks that way — it is we who are moving, not the Sun.
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Night comes on perfectly clear evenings too.
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The other is turned away into shadow. One whole spin takes about 24 hours, and that is one day.
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The Sun shines all the time — it is shining on someone right now.
Show the answer
- A It only looks that way — it is we who are moving, not the Sun.
- B Night comes on perfectly clear evenings too.
- C The other is turned away into shadow. One whole spin takes about 24 hours, and that is one day.
- D The Sun shines all the time — it is shining on someone right now.
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Question 7 of 10
How does a mirror work?
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In a dark room a mirror shows nothing.
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It keeps the picture in order; a rough surface bounces light too, but scatters it, so you see no reflection.
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It shows whatever comes along, including things it has never seen before.
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Step aside and your reflection leaves instantly.
Show the answer
- A In a dark room a mirror shows nothing.
- B It keeps the picture in order; a rough surface bounces light too, but scatters it, so you see no reflection.
- C It shows whatever comes along, including things it has never seen before.
- D Step aside and your reflection leaves instantly.
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Question 8 of 10
How does popcorn pop?
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Nothing grows — it turns itself inside out.
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Popcorn pops in a hot-air popper with no oil at all.
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The push comes from inside the kernel.
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It pushes harder and harder until the kernel bursts inside-out — which is why only corn with a tough skin will pop.
Show the answer
- A Nothing grows — it turns itself inside out.
- B Popcorn pops in a hot-air popper with no oil at all.
- C The push comes from inside the kernel.
- D It pushes harder and harder until the kernel bursts inside-out — which is why only corn with a tough skin will pop.
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Question 9 of 10
What are rocks made of?
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Break a rock open and you find several different things sparkling inside.
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Soil is often made *from* rock, worn down over ages.
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Some rocks are pressed from layers of sand and shells, some cooled from melted rock.
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Ice melts; rock does not.
Show the answer
- A Break a rock open and you find several different things sparkling inside.
- B Soil is often made *from* rock, worn down over ages.
- C Some rocks are pressed from layers of sand and shells, some cooled from melted rock.
- D Ice melts; rock does not.
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Question 10 of 10
Why is it warm when the Sun shines on you?
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There it turns into warmth. Light can fly through empty space, and what it delivers is energy.
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The Sun stays about the same distance away all year long.
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There is no air between us and the Sun for it to blow.
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A torch is bright too, and its light is cool on your hand.
Show the answer
- A There it turns into warmth. Light can fly through empty space, and what it delivers is energy.
- B The Sun stays about the same distance away all year long.
- C There is no air between us and the Sun for it to blow.
- D A torch is bright too, and its light is cool on your hand.
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